临江林业局森林资源结构动态分析与经营对策

Dynamic Analysis and Management Countermeasure of Forest Resource Structure in Linjiang Forestry Bureau

利用吉林省临江林业局1977、1982、1987、1992和1996年5期林相图和1 000余块样地逐年复查数据,对该局20a来土地种类、林分起源、优势树种和龄组等项森林结构以及林分蓄积量和生产力进行动态分析,总结临江林业局森林资源结构中存在的问题并提出相应的经营对策。结果表明,1987～1996年份间临江林业局森林资源除林地土地面积变化不明显外,存在以下问题:林分中珍贵树种所占比例不大,优势树种所占的蓄积百分比越来越少;幼龄林和近熟林的比重都在逐渐增大,中龄林的比重先增加再减少而幅度不大,但过熟林的比重则在大幅度减少;成过熟林过少,森林可采资源太少;不同林分天然林面积都大幅度减少,而人工林更新的速度远远跟不上采伐的速度。建议采用采育林森林经营模式及相关措施来调整其森林资源结构。

The forest structures like land types, origin of stands, dominant species and stands age as well as forest stock volume and productivity in recent 20 years of Linjiang forestry bureau, Jilin province were dynamically analyzed based on annual review data of 1000 plots and 5 forest maps of 1977, 1982, 1987, 1992 and 1996. The problems existed in the forest resources wen summarized and the corresponding strategies were put forward. Results show that, besides the land area is not obviously changed, there are still many problems such as the proportion of rare species is relatively small. and the volume percentage of dominant species gradually decreases. The proportion of young forest and mature forest is gradually increasing, and middle- age forest first increases and then decreases with slightly changed as a whole. The mature and overmature forest is little, and so is recoverable forest resource. The area of nature forest with different stands decreases greatly, and the update speed of plantation can not keep up with that of harvesting. Therefore, it is recommended to adopt cutting-and-culturing forest management mode and relevant measures to adjust the forest resource structure.